largefiles: don't attempt to clone all largefiles to non-local destinations

hgext/largefiles/overrides.py

@@ -704,6 +704,12 b' def overridepull(orig, ui, repo, source='
     return result
 
 def overrideclone(orig, ui, source, dest=None, **opts):
+    if dest is None:
+        dest = defaultdest(source)
+    if opts.get('all_largefiles') and not hg.islocal(dest):
+            raise util.Abort(_(
+            '--all-largefiles is incompatible with non-local destination %s' %
+            dest))
     result = hg.clone(ui, opts, source, dest,
                       pull=opts.get('pull'),
                       stream=opts.get('uncompressed'),

tests/test-largefiles.t

@@ -444,6 +444,10 b' Test cloning with --all-largefiles flag'
   3 largefiles updated, 0 removed
   8 additional largefiles cached
 
+  $ hg clone --all-largefiles a ssh://localhost/a
+  abort: --all-largefiles is incompatible with non-local destination ssh://localhost/a
+  [255]
+
 Test pulling with --all-largefiles flag
 
   $ rm -Rf a-backup